Leomidas baxter



L. BAXTER.

SPRING MOTOR.

APPLICATION man OCT. 24. um.

Patented Sept. 9, 1919.

2 SHEETSSHEET I H l Illlll ll HHI y @1402 ntoz THE \IOLUMIXIAPLANOGRAIHI cm, WASHINGTON, D c.

L. BAXTER.

SPRING MOTOR.

APPLICATION FILED 0cT.24. 1917.

Patented Sept. 9,1919.

Z SHEETS-SHEET 2- at; rmfummm PLANOGRAPII 60., WASHINGTON, D. c.

SATES PATENT OFFICE.

LEONIDAS BAXTER, OF DAYTON, 'OI-IIO, ASSIGNOR TO THE THOMAS MANUFACTURING COMPANY, OF DAYEEGN, OHIO, ACORPORATION OF OHIO.

SPRING-MOTOR.

Specification of Letters Patent.

Application filedootob'er 24, 1917. Serial No. 198,283.

To all whom it may concern Be it known that I, LEONIDAS Bnx'rnn, acitizen of the United States, residing at Dayton, in the county ofMontgomery and State of Ohio, have invented certain new and usefulTll'lPlOVGll'lGlltS in Spring-Motors, of which the following is aspecification.

This invention relates to new and useful improvements in spring motors.

The principal object' of my invention is to provide a combination speedregulator and brake for the motor, that is simple in construction andeflicient in operation.

Another object of the invention is to provide a micrometer device forcontrollingthe engagement between the worm on the governor shaft and theworm wheel-on the turntable shaft, to insure a practically noiselessmotor having increasedefliciency.

Another object of the invention is the provision of an adjustablebearing for the turntable shaft.

And still another object of the invention is the provision of amicrometer device for regulating the end play of the governor shaft.

Other important and incidental objects will be brought out in thefollowing specification, and particularly pointedout in the subjoinedclaims.

The preferred form of embodiment of my invention is illustrated in theaccompanying drawings, of which Figure 1 is a side elevational view ofmy improved spring motor. Fig. 2 is a view, partly insection, of themicrometer device for regulating the engagement between the governorshaft worm and the turntable shaft worm wheel. Fig. 3 is a view, partlyin section, of the micrometer device for controlling the end play of thegovernor shaft. Fig. 4 is a front view of one of my improved governorarmsupporting devices. Fig. 5 is an elevational view of the speed regulatorand brake for the motor. Fig. 6 is a side view of the brake-operatinglever pivoted to the main motor frame. Fig. 7 is a side view of theforked operating arm adapted to be secured to said lever. Fig. 8 is asectional view of the adjustable bearing for the turn table shaft. Fig.9 is a plan view of the split bushing forthe latter. Fig. 10 is a sideview thereof. Fig. 11 is a top plan view of the motor cabinet, showingthe speed-regulating device and brake control.

and the plate 5.

Fig. 12 is a side view of the speed regulator.

Fig. 13 is a view thereof with the lower portion in section. And Fig. 14is a sectiona-l view on the line are of Fig. 13.

Throughout the specification and draw- 1 gs, similar referencecharacters denote corresponding parts.

In a detailed description of the preferred form of embodiment of myinvention, the numeral 1 designates the top, 2the front wall, 3 the rearwall and 4 the bottom of the motor cabinet. .Depending from the top 1 ofthe cabinet, is a supporting plate 5 having downwardly rojectingportions 6, 7, 8 and 9 for supporting the motor parts. (See Fig. 1.)

Suitably journaled in the supporting structure just described is aspring motor a 10 of the type described in my application SerialNo.163,795. This motor has a driv ing. gear 11 which meshes with a pinion12 on a transverse stub shaft 13. Fixedly se cured to the other end ofthe stub shaft 13 is a bevel gear 14 in mesh with a'bevel gear 15 on avertical shaft 16 whose upper end has a bearing in the plate 5 and whoselower end is journaled in a bearing in a flatmember 17 secured tothedownwardly extending portions 7 and 9 of the plate 5.

Fixed on the lower end ofthe shaft 16 is a gear 18 which meshes with apinion 19 fast 011 the lower end of a turntable shaft 20. The lowerendof this shaft is journalcd in a bearing 21 secured to the member '17 itsupper portion passing through an ad justable bearing in the plate 5, nowto be described.

Referring to Fig. 8, the shaft 20 extends upwardly through a hole 22 ina boss28 Adapted to engage the lower end 24 of the boss 23, is anannular flange 25 on the shaft 20 to limit the upward movement of thelatter. The hole 22 is threaded and enlarged a short distance above thelower end 24 of the boss 23 to receive a tapered and threaded splitbushing 26. p

The threaded bushing 26 and hole 22 taper downwardly for the followingreason: Should the hole 22 be reamed too large or too small, orbecomelarger by reason of wear, even to the extent of a thousandth of an inch,the shaft 20 may be accommodated to the increased or decreased diameterof the hole by screwing the bushing26 downwardly or upwardly the desireddistance with a tool adapted to engage the recesses 27 2t therein.

"(See Figs; 9 and 10.) After the bushing 26 7 is adjusted to its desiredposition, a collar cap 28 is inserted over a packing 28 in an enlargedhole provided in the short boss 29 that extends upwardly from said plate5.

Fast on the lower end of the shaft is a worm wheel 30 which is adaptedto be engaged by a worm 31 provided on a governor shaft 32. For thepurpose of adj ustably supporting the front end of the governor shaft 32so that the worm 31 may be moved into and out of engagement with theworm wheel 30, the following device is provided:

Referring to Figs. 1 and 2, there is pro vided in the downwardlyextending portion 7 a transverse groove 33 in which a bearing block 34is laterally movable. This bearing block contains in its upper end abore 35 terminating in a conical recessed inner end, and is adapted toreceive a bushing 36 havmg a concaved inner end. Within the spacebetween the concaved ends of the hole 35 and bushing 36 there isplaced'a ball bearing 37 which has a free movement therein and which isadapted to be engaged by the inner end of the governor shaft 32. (SeeFig. 2.)

For the purpose of moving the'bearing block within the recess 33 tocarry the worm 31 toward and away from the worm wheel 30, there isprovided a screw 38 that is adapted to be inserted in a socket 39 in theside face of the downwardly extending portion 7. Preferably integralwith the screw 38, be-

yond its threaded portion, is a graduated c0llar40 adapted to looselyenter an annular groove 41 that is provided in the bearing block 34 nearits outer end. The collar-wt) contains a series of peripheralgraduatirms 42 whereby it may 'be turned av desired distance by a milledhead &3 on the outer end of the screw 38, to adjust the engagement ormesh between the worm 31- and the worm wheel 30; After this engagementbetween the worm and worm wheel has been adjusted for a noiseless andetiicient' operation of the fmotor, the bearing block '3-l may be heldin its adjusted position by a screw 4:4: inserted into a hole therein,from the side of tee downwardly extending portion'7. By the use of thismicrometer device, it is thus possible to adjust the engagement betweenthe worm wheel 30 and worm 31 to approxiarms Hi8 whose opposite ends aresecured to a bell haped element similar to the boss 46. Suitably securedto the middle portion of each of the arms 48 is a centrifugal weight 50.

Referring to Figs. 3 and 4-, there is provided in the flaring portion-l-7 of the boss 46, and in the flaring portion 51 of the element a9 aslot 52 for each of the centrifugal arms 48. These slots F 2 areprovided so that the arms 48 may extend through them in an approximatelystraight line as shown in Figs. 1 and 3, when the motor is not runningor running slow, and to restrain their outward movement beyond a dangerpoint when the motor is operating at great speed. During their expandingperiod, the arms 4-3 cannot be moved by the weights beyond the ends ofthe slots 52 through which they extend, and these ends are positioned asufiicient distance from the edge of the flaring rim of the arm supportto prevent said arms from overexpansion or contact with other parts totheir injury. The centrifugal arm supporting elements 16 and 19 areconnected together by a telescopic sleeve 53 through which the governorshaft 32 passes.

For the purpose of adjusting the end thrust of the shaft 32, thefollowing device is provided: Referring to Fig. 3, the numeral 54;designates a bearing member which is movable through a transverse holeprovided in the downwardly extending portion 8 of the plate The bearingmember is preferably cylindrical in cross section, and contains in itsfront end a bore that re ceives a bushing 56 having a concaved innerend. The opposite end of the bore 56 is also concaved to provide betweenthe inner end of the bushingand the inner end of the bore a space forthe free movement of a ball-bearing 57 which the inner end of the shaft32 is adapted to engage.

For the purpose of insuring a proper engagement between the ends of theshaft 3'. and the ball bearings 37 and 57, the bearing member 54: may bemoved in. either direction by a screw 08 which enters a threaded bore'59 that transversely passes through the downwardly extending portion 8of the plate 5. This screw has an annular graduated collar 60 whichloosely enters an annular groove 61 provided in the outer end of thebearing member 54. Accordingly, when the milled head 62 on the outer endof the screw 58 is turned, the bearing member 54 will be given alongitudinal movement by the annular collar 60. Furthermore, the collar60 has peripheral graduations 63 whereby the shaft may be longitudinallyadjusted to the bearings 37 and 57, to approximately a thousandth of aninch with accuracy, and is held in its adjusted position by a screw 63.i

In order to regulate the speed at which the talking machine recordrotates, and to stop the latter completely when desired, the disk l5 isadapted to be engaged by two friction pieces 64:, one on each side ofthe boss 46. (See Figs. 1 and 5.) Each friction piece 6-4: is carried bythe lower end of an arm 65. These arms 65 areconnected by an integralcross piece 66 which is preferably secured by a rivet 67 to an inwardlyextending portion 68 of a lever 69 that is pivotally secured by a screw7 Otto the side portion 71 of the plate 5. The lever 69 has a rearwardlyextending portion 72 from the lower edge of which thereprojectszoutwardly a tongue 73. (See Figs. 1, 5 and: 6.) Upon thistongue rests the lowerwend of a vertically and rotatably movable element74 which extends loosely through the vertical sleeve portion 7 5 of abracket 76 secured to the top face of the plate 5. Referrlng to Fig. 5,the front lower sideof the sleeve portion is formed toslope downwardlyand inwardly to provide a camsurface which a pin 77 projecting outwardlyfrom the lower end of the element 7%, is adapted to engage.

hen the element 7 4: is turned clockwise, it will be forced downwardlythrough the engagement of its pin 77 with the sloping surface of thesleeve 75. During its downward movement, the element 74 will pressagainst the tongue 73 with sufficient force to cause the lever 69 whichcarries the latter, to bring the friction pieces 6 L into sufficientlytight engagement Wlth the dlsk to stop the motor, and when this point isreached, the pin 77 will have lodged in slight recess 78 in the curvedsurface of the sleeve 75, to be held there for the purpose of preventingthe motor from running until it is again desired to start it. i

For the purpose of enabling this brake device to be convenientlyoperated by the user of the machine, the element 7 4. extends asufficient distance above the top 1 of the cabinet to fixedly receiveone end of an arm 79. To the other end of said arm there is attached aknob 80 whereby it may be readily moved by the operator to turn theelement 74: for the purpose of starting or stopping the motor. Themovement of the arm 79 is limited in each direction by screws 81 81which are connected by a flat piece 82 beneath which said arm isoperable. (See Figs. 1 and 11.)

In order to combine the brake just described with a speed-regulatingdevice for the motor, the following construction. is provided. Referringto Figs. 1, 11, 12, 13 and 14-, there is provided on the top 1 of thecabinet a speed-indicating dial 83. This dial, which contains a largenumber of graduations 8st, is preferably secured to the cab-inet top 1by means of screws 85. Fixedly secured within an aperture in the middleportion of the dial 83 is a sleeve 86 which i from a point near itslower posed so that its outer end may reglster with thegraduations 8l-onthe dial 83. Applied to the sleeve 86 for a vertical and rotatablemovement thereon, is a slotted sleeve 90 whose lowerend is tapered totightly receive a downwardly projecting pin 91.

In one sideof the sleeve 90 a straight slot 92 1s provided, said slotextending from the upper middle portion of said sleeve downwardly to itstapered portion. (See Fig. 12.) Opposite the slot 92, and extending endto a point a' short distance above its upper end, is a spiral slot 93into which loosely extends a pin94 secured to the sleeve 86. From thelower end. of the adjusting elen'rent 87 there loosely; extends into thestraight slot 92, a

pin 95. Accordingly, when the knurled knob 89 is turned,the pin 95 willbe rotated by the adjusting element 87 to whichsaid knob is secured, toturn the slotted sleeve 90. But

this sleeve 90 also contains a spiral slot into which the fixed pin 94extends from the sleeve 86. Therefore, whenthe knob 89 is turned, theslotted sleeve will be given a vertlcal movement through the engagementof its spiral slot 93 with the fixed pin 94:, to

raise and lower the pin. 91 for a purpose new to be described.

Referring to Figs. 1 and 7, the numeral 96 designates a forked piece,whose forked end isadapted to receive a screw 97 secured to therear endof the lever 69. Pivotally secured to. a screw 98 secured to the rearportion of the plate 5, 1s one end of a lever arm 99 which extendsoutwardly a suflicient dis tance to bring the slot 100 in its outer endto a position to loosely receive the pin 91 secured to the sleeve 90.The forked piece 96 has a reduced end 101 which is adapted to looselyextend through an aperture in the middle portion ofthe lever arm 99. Acoil spring 102 secured to the shank of the screw 98 normally exerts itsforce against the illner end of the lever arm 99 to raise the latter,and with it the reduced end 101 of the forked piece 96, which in turnactuates the lever 69 to hold the friction pieces 64 out of engagementwith the disk 45.

However, by turning the knob 89 to a position wherein the polnter 88will register with a graduation on the dial 83 indicating a desiredmotor speed, the sleeve 90 will be lowered to a position to restrain theupward movement of the spring-pressed lever arm 99 at a point wherethefriction pieces 64 will engage the disk 45 with sufficient force to givethat speed. Therefore, it will be seen that by turning the knob 89 tobring the I regulating mechanism, cause the element 74 to press thetongue 7 3 downwardly a sufficient distance to accomplish that result.It will thus be seen that I have provided a combination brake andspeed-regulatin mechanism which is easily operated and e cient.

I do not wish to be limited to the details of construction andarrangement herein shown and described, and any changes or modificationmay be made therein within the scope of the subjoined claims.

Having described my invention, I claim:

1. In a spring motor, the combination with a governor shaft, a supporttherefor, a worm on said shaft, a bearing in one part of said supportfor one end of said shaft, a driving worm wheel adapted to be engaged bysaid worm, of a bearing block transversely movable in said support toreceive the other end of said shaft, and a micrometer device adapted tolaterally shift the bearing block a desired distance to adjust theengagement between said wormand worm wheel.

2. In a spring motor, the combination with. V a governor shaft, asupport therefor, a bearing mounted in one part of said support for oneend of said shaft, a worm on said shaft, a driving worm wheel which saidworm is adapted to engage, of a bearing block slidable in arecessprovided in a flat portion of said support, to receive the otherend of said shaft, a screw insertible in said support in'alinement withsaid bearing block, a head for said screw, a graduated annular collar onthe latter adapted to loosely enter a peripheral groove in said block tomove it transversely for the purpose of adjusting the engagement betweenthe worm and worm wheel when the head of the screw is turned,

a governor shaft, a bearing piece for each end of said shaft having abore whose inner end is tapering, of a bushing insertible in each boreto receive its respective end of said shaft, each bushing having aconcaved inner end, and a ball bearing having a free movement in thespace between the inner end of the bore and its respective bushing to receive the end thrust of its respective end of the governor shaft.

4. In a spring motor, the combination with a governor shaft, a supporttherefor, a bearing in one part of said support for one end of saidshaft, of a bearing for the other end of said shaft, movable in thedirection of the length of the latter through another p rt of saldsupport, and a micrometer device adapted to longitudinally shift thebearing member a desired distance to adjust the end thrust of the shaft.

5. In a spring motor, the combination with a governor shaft, a supporttherefor, a hearing in one part of said support for one end of saidshaft, of a bearing member slidable through another part of said supportin the direction of the length of said shaft, to receive the other endof the latter, a screw insertible in said support in alinement with saidbearing member, a head for said screw, a graduated annular collar on thelatter adapted to loosely enter an annular groove in said bearing memberto move it longitudinally for the purpose of adjusting the end thrust ofthe governor shaft, and a second screw adapted to be passed into thebearing member from the support to hold it in its adjusted position.

In testimony whereof I have hereunto set my hand.

LEONIDAS BAXTER. Witness:

E. M. Losn,

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

